Building a Cordless Plasma Lightsaber

Hacksmith Industries has made plasma lightsabers in the past, but they all required a bulky external energy source to function. Now they’ve figured out a way to go cordless. Their latest design produces a face-melting 4500ºF beam, but its fuel and power source fit inside its (very long) handle. The 11,000-watt torch runs for 3 minutes per refill.